公开(公告)号：US5832417A

公开(公告)日：1998-11-03

申请号：US757797

申请日：1996-11-27

申请人： Steven P. Petrucelli ,  Damon Germanton ,  Stephen A. Orbine

发明人： Steven P. Petrucelli ,  Damon Germanton ,  Stephen A. Orbine

IPC分类号： G01G23/01 ,  G01C25/00

CPC分类号： G01G23/01

摘要： The present weight scale performs automated self calibration by periodically initiating a measurement operation to determine the zero offset from a true weight reading due the weight scale's intrinsic weight. The weight scale's intrinsic weight will vary due to changes in environmental conditions such as temperature and humidity, which impact the behavior of the internal electronics that perform the weight measurement operations. The automated self calibration is provided by a counter circuit, clocked by a low power oscillator, that periodically initiates the weight scale's electronics to undertake a weight measurement of the tare weight value of the scale. The tare weight value is stored in memory until replaced by a subsequent tare weight value calculation. During a weight measurement operation the gross weight measurement is deducted by the tare weight value stored in memory to arrive at a net weight representing a user's true weight.

摘要翻译： 当前的重量级通过周期性地开始测量操作来执行自动自校准，以确定由于重量级的本征重量而从真正的权重读数的零偏移。 重量级的内在重量将因环境条件（如温度和湿度）的变化而变化，这会影响进行重量测量操作的内部电子元件的行为。 自动自校准由由低功率振荡器计时的计数器电路提供，周期性地启动重量级的电子装置以进行秤的皮重值的重量测量。 皮重值存储在存储器中，直到替换为随后的皮重值计算。 在重量测量操作期间，通过存储在存储器中的皮重值来扣除总重量测量值，以获得表示用户真实重量的净重。

公开(公告)号：US06292690B1

公开(公告)日：2001-09-18

申请号：US09481584

申请日：2000-01-12

申请人： Steven P. Petrucelli ,  Stephen A. Orbine

发明人： Steven P. Petrucelli ,  Stephen A. Orbine

IPC分类号： A61B505

CPC分类号： A61B5/4872 ,  A61B5/05 ,  A61B5/0537

摘要： A circuit for measuring body impedance comprising a voltage source having a predetermined frequency and a current source; a first pair of electrodes adapted to receive one portion of the body for applying said current source to said body; a second pair of electrodes adapted to receive another portion of the body for sensing a voltage therebetween; a comparator having first and second inputs and an output for producing an output signal based on signals applied to said first and second inputs; an instrumentation amplifier arrangement coupled to one of said comparator inputs and responsive to the voltage across the second pair of electrodes for providing an input signal to said first comparator input; a variable resistor coupled to the second input of said comparator and responsive to said voltage source for developing a first voltage signal applied to said second comparator input; and a processor responsive to the output signal of the comparator for controlling the resistance of the variable resistor to cause a corresponding change in said first voltage, whereby when said voltage at said first input corresponds to the voltage at said second input of said comparator; said comparator output signal transitions from a first state to a second state to cause the processor to terminate resistor adjustment, whereby the body impedance value corresponds to the resistance value of the variable resistor.

摘要翻译： 一种用于测量身体阻抗的电路，包括具有预定频率的电压源和电流源; 第一对电极，适于接收身体的一部分，用于将所述电流源施加到所述身体; 第二对电极，适于接收身体的另一部分，用于感测其间的电压; 具有第一和第二输入的比较器和用于基于施加到所述第一和第二输入的信号产生输出信号的输出; 耦合到所述比较器输入之一并响应于所述第二对电极上的电压的仪表放大器装置，用于向所述第一比较器输入提供输入信号; 耦合到所述比较器的第二输入端的可变电阻器，响应于所述电压源，用于产生施加到所述第二比较器输入端的第一电压信号; 以及响应于所述比较器的输出信号的处理器，用于控制所述可变电阻器的电阻以引起所述第一电压的相应变化，由此当所述第一输入处的所述电压对应于所述比较器的所述第二输入处的电压时; 所述比较器输出信号从第一状态转变到第二状态，以使处理器终止电阻器调整，由此体阻抗值对应于可变电阻器的电阻值。